Copy/Paste from output

[John Darrington]

I've commited a few changes to master which enables Copy from the output viewer.
It needs tidying up a bit - in particular, the use of tempnam is not very nice;
it would be better if the drivers could be configured to put their output in 
memory.

Also, it might be better if the HTML driver could be configured not to include
any style.

Anyway, I briefly tested it pasting to Kword, Openoffice, Emacs and Gedit, and 
got reasonable results.  Strangely, it seems that Openoffice doesn't accept an 
ODT clipboard target, yet kword does.

No doubt there are bugs yet to be discovered.


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